Implement for truing the internal forms of tubes.



No. 816,451. PATENTED MAR. 27, 1906. F. A. FORWOOD.

IMPLEMENT FOR TRUING THE INTERNAL FORMS OF TUBES.

APPLICATION FILED DEG.30.1903.

WITNESSES: INVENTOR:

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v m il/q I No. 816,451.

' man e'rxrns rxrnnr' orrron FRANCIS A. FORWOQD, OF CHESTER, PENNSYLVANIA. EMPLEMENT FOR TRUENG- THE BNTERNAL FQRWiS OF TUBES.

Specification of-Letters Patent.

Patented March 27, 1906.

Application filed December 30, 1908. Serial No. 187.126.

To all whom it may concern:

Be it known that I, FRANCIS A. FORWOOD,

of Chester, in the county of Delaware and.

State of Pennsylvania, have invented certain new and useful Improvements in Implements for Truing the Internal Forms of Tubes, whereof the following is a specification, refer-. ence being had to the accompanying drawmgs.

My invention relates to devices arranged to remove any defects, such as unevenness or indentations, in a cylindrii'ormtube.

It is the object of my invention to provide an implement that may be passed into and, if necessary, through a tube, which may be rotated relatively therewith and provided with diametrically-expansible members arranged to press out any indentations or blisters which may occur upon its internal surface.

My invention further includes means ar-' ranged to prevent the expansible members from extending beyond the normal internalmovement to which said bearings are subjected.

My invention includes the various novel features of construction and. arrangement hereinafter more definitely specified.

In the accompanyingdrawings, Figure I is a central longitudinal section of a convenient form of my invention and the tube being operated upon. Fig. II is an end elevation as seen from right of Fig. I. Fig. III is a transverse vertical section taken on the line III III in Fig. I. Fig. IV is a transverse vertical section taken on the line IV IV in Fig. I. Fig. V is a transverse vertical section taken on the line V V in Fig. I.

In said figures, l is a radially-slotted supporting body whose slots -2 terminate in equally-s aced semicylindriform sockets 3 in its perip ery, arranged to receive the dia-v in the slots 2 and extend into the central a erture 6 within the body 1. Each of t e bearings 4 comprises a roller 8, whose trunnions 9 are 'ournaled therein, as best shown m Fig. I. T 'e inner extensions 5 of said bearings 4 have-their inner faces 7 inclined to con form with the tapered portion 10 of the bar 11, which is arranged to extend through the aperture 6 of the body 1 and be thrust in an axial direction to shit all of said bearings outwardly and to maintain the axes of their rollers in parallel and equidistant relation to the central axis. Said body 1 is provided with splines or keys 13, arranged to project in respective corresponding keyways 15 in the bar 11, so asv to ermit the free longitudinal movement of said bar Within the body 1, but prevent relative rotary movement. The bar 11 is provided with a split collar 16, which is adjustably secured therelimit the movement of the bar 11 into the body 1, and thereby determine the extent of diametrical expansion of the bearings 4 and their rollers 8, which are arranged to engage and roll upon the interior surface of the tube 18. The end of the bar 1 1 is provided with a shoulder by which the body 1 is withdrawn when said bar 11 is retractedto release the bearings 4. Said rollers 8 each have a cylindrical periphery 21 throughout the greater portion of their length, but terminate in a conical periphery 22 at their forward ends, so that they may readily enter the tube 18 and may gradually press out the blisters or indentations encountered by being thrust in an around.

It may be observed that the device herein -shown and described is of such dimensions as to be capable of being inserted within and assed through the tube to be operated upon. It is therefore capable of correcting defects which may occur remote from the ends of said tube.

The im lement ma be inserted in a' section of tu e having the desired internal diameter and the bar thrust into the body 1 until its tapered periphery presses the bearings 4 outward sufliciently to engage the rollers 8 firmly against the interior of the tube The collar 16 is then set upon the 'bar 11,v against the body 1, as shown in Fig. I, and further expansion of the bearings 4 is thereby prevented. Said implement is then inserted axial direction while the tube is rotated there- 7 on by means of the bolts 17 and arranged to nut 19, having a .flange 20, which forms a I in the tube to be trued, which may be rotated by any suitable means, while the implement is thrust therethrough in the direction indicated by the arrow in Fig. I with its rollers rotating upon the inner surface of said tube to roll out any defects therein encountered,

which are first graduall pressed out by the conical surfaces 22, followed by the cylindrical surfaces 21 to produce a smooth cylindric internal surface in the tube.

When it is desired to withdraw the imple ment, the bar 11 is shifted rearwardly until the flange 20 en ages the forward end of the body 1, in whic position the rollers 8 are contracted to their innermost extent and may then be readily withdrawn.

I claim a 1. In an implement for truing the internal forms of tubes, the combination of a radiallyslotted body containing within its slots diametrically-ex ansible bearings each carrying a roller, said ody with its bearings and rollers being adapted to be indefinitely progressed throng a tube which is to be trued;. a bar carrying said body, slidably fitted therein, and havin a taperm portion adapted to expand said hearings w hen thrust forward within the radially-slotted body; means for preventing rotation of said slotted body upon said bar; and an adjustable collar upon said bar of a size small enough to pass through thetube to'be trued by which the extent to which the bar may be thrust into the bodyis limited, substantially as set forth.

2. In an implement for truing the internal forms of tubes, the combination of a radiallyslotted body containing within its slots diaeraser metrically-expansible bearings each carrying a roller with a cylindrical and a tapering face, said bod "with its bearings and rollers being adapte to be indefinitely progressed through a tube which is to be trued; a bar carr 'ng said body, slidably fitted therein, and aving a tapering portion adapted to expand said bearings when thrust forward within the radially-slotted body; means for preventing rotation of said slotted body upon said bar; and an adjustable collar upon said bar of a size small enough to pass through the tube to be trued by which the extent to which the bar may be thrust into the body is limited, substantially as set forth.

3. In an implement for truing the internal form of tubes, the combination of a radiallyslotted body containing within its slots diametrically-expansible bearings, each carrying a roller, the said body with its bearings and rollers being free to be indefinitely rogressed through a tube which is to be trued; a bar by which said body is carried, slidably fitted therein, and having a tapering portion adapted to expand said bearings; means for preventing rotation of said slotted body upon said bar; and shoulders u on the bar which limit the motion of the b0 y upon it in either direction, and both of which are small enough to pass free] within the tube to be trued, between whic shoulders the body is free to slide longitudinally upon the bar, substantially as set forth.

FRANCIS A. FORWOOD.

Witnesses:

IRA S'rovnn MYERS, S. LnoYn WmeANn. 

